This command lets you set the length of a track visually instead of numerically. To set the length of a track:
Tracks can be shortened or lengthened using this method. If a track selection exists, all of the selected tracks are set to the indicated length.
If the cursor isn't over the step view, the error message "Cursor must be over track step to indicate desired length" is displayed.
If a step selection exists, it takes priority. In this case the track is shortened so the leftmost step of the step selection becomes the track's last step. If the step selection includes multiple tracks, they're all shortened.